Mariah Carey entered a hospital Wednesday night for treatment of "extreme exhaustion," according to her publicity firm.

In a terse press release, the PMK publicity firm suggested that the pace of filming two movies, "Glitter" and "Wise Girls," while completing the Glitter album, caused Carey to become exhausted.

"I'm trying to understand things in life right now and so I really don't feel that I should be doing music right now," Carey said earlier this week in a despondent voice message left on her official Web site, according to a fan-site transcript confirmed by Cindi Berger, Carey's spokesperson at PMK.

The message, and another one left soon afterwards, has disappeared from Carey's site (www.mariahcarey.com). Berger said that Mariah was "obviously exhausted and not thinking clearly" when the singer left the rambling messages, which included complaints of unspecified problems with her management and record label.

"What I'd like to do is just a take a little break or at least get one night of sleep without someone popping up about a video," Carey said. "All I really want is [to] just be me and that's what I should have done in the first place ... I don't say this much but guess what, I don't take care of myself."

Berger declined to provide any more details on Carey's situation. Her manager did not immediately return a call for comment.

According to MTV's publicity department, Carey has canceled her scheduled headlining appearance at MTV's 20th birthday celebration, "MTV20: Live and Almost Legal," August 1 in New York (see [article id="1445404"]"Diddy, Durst, Kid Rock, Ja Rule Added To MTV Birthday Bash"[/article]).

Carey's current single, "Loverboy," jumped from #60 to #2 on this week's Billboard Hot 100, thanks to high sales. Before going on sale last week, the single had suffered from sluggish radio play. The Hot 100 is based on both sales and airplay.